Convection heater



FIG. 1 is a front view of the convection heater;

FIG. 2 is a rear view of the convection heater;

FIG. 3 is a left side view of the convection heater;

FIG. 4 is a right side view of the convection heater;

FIG. 5 is a top view of the convection heater;

FIG. 6 is a bottom view of the convection heater; and,

FIG. 7 is a perspective view of the convection heater. 

The ornamental design for a convection heater, as shown and described. 